Objetivou-se avaliar o crescimento, a partição de assimilados e a produção de frutos de melão tipo Charentais híbrido 'Fleuron' em cultivos sombreados por diferentes malhas. O experimento foi conduzido na Universidade Federal de Viçosa, no período de 24/11/2003 a 11/03/2004. Os tratamentos foram constituídos de quatro ambientes de cultivo: controle (pleno sol) e sob as malhas Aluminet® 30%-O, Cromatinet® 30%-O e Sombrite® 30%, com reduções na radiação solar fotossinteticamente ativa (RFA) de 30,85%, 35,9% e 32,0%, respectivamente. O delineamento experimental foi inteiramente casualizado, com quatro repetições. Para as características avaliadas periodicamente utilizou-se o esquema de parcela subdividida 4 x 7 com os ambientes alocados nas parcelas e as avaliações periódicas (0, 14, 28, 42, 56, 70 e 84 dias após o transplante) nas subparcelas. Dentre os ambientes sombreados, o cultivo sob Aluminet® 30%-O foi o que mais se destacou por ter apresentado resultados equivalentes ao controle quanto à altura de planta, comprimento e número de entrenós, número de folhas por planta, massa seca de folha e produção total e comercial de frutos e superado esse quanto à área foliar por planta. A baixa insolação média diária (4,47 h) e o bom desempenho em crescimento e produção do meloeiro, quando sombreado em 30,85% pelo Aluminet® 30%-O, são indicativos de que o melão não é uma cultura altamente exigente em luz como se tem apregoado. O cultivo do meloeiro sob restrição de luz mostrou-se promissor abrindo perspectivas para o cultivo em sistemas agroflorestais ou em cultivos associados.

In this experiment we evaluated the growth, partition of assimilates and yield of melons type hybrid Charenthais 'Fleuron' under different shading nets. The experiment was conducted at Federal University of Viçosa, from November 24, 2003 to March 11, 2004. The treatments consisted of four growth environmental conditions, as follows: control (full sun), and under Aluminet® 30%-O, Cromatinet® 30%-O, Sombrite® 30%, with reduction of photosynthetic active radiation (PAR) of 30.85%, 35.9% and 32.0%, respectively. The experiment was arranged in a complete random design with four replicates. For the periodically evaluated characteristics we used a sub divided parcel 4 x 7 with the growing conditions in the parcel and the evaluations on the sub parcel (0, 14, 28, 42, 56, 70 and 84 days after transplantation). Among the shading nets, overall growth was superior under Aluminet® 30%-O, with similar plant height, length and number of internodes, number of leaves per plant, leaf dry weight, total and commercial yield of fruits and greater leaf area per plant compared to control at full sun. The low number of daily radiation (4.47 hours) and the good growth and yield of the melon when shaded by 30.85% with Aluminet® 30%-O, are indicatives that this culture does not require elevated levels of radiation as mentioned before. The growth of melon under partial restriction of light is promising, opening opportunities to production in new environments as agroforestry systems and associated cultivations.

Fulminant hepatic failure (FHF) is characterized by massive hepatocellular injury, whose physiopathology is still unclear. Hepatitis B (HBV) is probably the most common viral cause of FHF, while hepatitis A (HAV) virus seem occurs less frequently. However, the host and viral factors that determine the outcome of these infections are poorly understood. In the present study, viral load and genotyping determining regions of HAV and HBV genomes were sequenced. Eight FHF patients and one patient with severe acute hepatitis (SAH) were included. Liver and blood samples were collected during liver transplantation or necropsy procedures. HAV-RNA and HBV-DNA were extracted from serum, biopsy and paraffin liver. Nucleotide sequencing of HAV-RNA was performed from VP1/2A and HBV-DNA from PreS/S region. The amplified samples were quantified by Real-Time PCR. The cases of HAV infection were due to subgenotype IA. The cases of HBV infection were due to genotype A2 and D4. The case of HAV/HBV coinfection was infected by genotype IA and D3. Hepatitis A and B infection were associated with genotypes most prevalent in Brazil. In hepatitis A infection the mean of period evolution was 13 days. In hepatitis B, FHF patients infected by genotype D have a shorter period of evolution than FHF patients infected by genotype A (mean 15 v. 53 days). There was no association with genotype-determining region with the severity of hepatitis, however nucleotide differences and high viral load could be observed among FHF.